---
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title: Einstein in Automation Studio
collection: admin
version: current
locale: en-us
portal_url: https://docs.salesforce.com/admin/current/en-us/mktg/264-0-0/mc_as_einstein_overview.md
canonical_url: https://help.salesforce.com/s/articleView?id=mktg.mc_as_einstein_overview.htm&release=264.0.0&type=5
source_site: help.salesforce.com
content_type: documentation
content_hash: e098a15e508eab10e156f719e5c8a888b51c7c83d92f8917e811ca169b0ff87d
description: Reach contacts when they’re most likely to engage by using Einstein Send Time Optimization in a Send Email activity. Help your contacts avoid message fatigue by selecting the right message for each contact at the right time. Message recommendations are based on saturation levels using Einstein Engagement Frequency in a Send Email activity.
products:
  - Marketing
  - Marketing Cloud Engagement
release: "264"
---
# Einstein in Automation Studio

Reach contacts when they’re most likely to engage by using Einstein Send Time Optimization in a Send Email activity. Help your contacts avoid message fatigue by selecting the right message for each contact at the right time. Message recommendations are based on saturation levels using Einstein Engagement Frequency in a Send Email activity.

- **[Einstein Send Time Optimization in Automation Studio](https://help.salesforce.com/s/articleView?id=mktg.mc_as_einstein_sto.htm&release=264.0.0&type=5)**  
    Reach contacts when they’re most likely to engage by using Einstein Send Time Optimization in a Send Email activity in Automation Studio. Einstein Send Time Optimization uses machine learning and 90 days of engagement data to determine the best time within the next 24 hours to send an email message to each contact.
- **[Einstein Engagement Frequency in Automation Studio](https://help.salesforce.com/s/articleView?id=mktg.mc_as_einstein_eef.htm&release=264.0.0&type=5)**  
    Use Einstein Engagement Frequency (EEF) in a Send Email activity in a bulk or batch send to maximize engagement rates and reduce unsubscribes. A segment is based on saturation levels to avoid sending contacts too few messages or too many. EEF automatically segments your contacts at send time based on their individual saturation levels.